Valve unit



Dec 5 W. M. MYERS VALVE UNI'T Filed March 29, 1946 im l* sril v INVENToR,

A wm. M. Mge 1.

MLM

TTYS

patented Dec. 5, Q

Y '25325681 i verve Unir n Wiiiram-.-Mf-Myera Fresno; @with Arriere 29, 194e.Swarm-ereA 2 Claimsf.. (Cl. 137-139) This' invention relates' general* to anA im proved valve unit adapte-det@be-interposed1-lin a fluid j preSsure'LcOrrduit to-- control fiowt theretlroughgthe-*valve unitl'being'f. especiallyde'- signedifruseinfthefairf pressure` suppl-weon-V duitl ofjfa': sandblastingemachne.

An object' or" the* present2 invention isto prc vide-'a nevelV valfveunitf arranged toeb'econtrolled; fronr a renr'ote" point* asiisl desired incertainu in stallations; sucl'rV as`- when' they valve-unit vvisusedv. corinectiorr With-lai!Sandblasting machine.

Another` object of L the-finventionis to provide ajvalvefunitwherein opening-'arid' closing` of the. valve` therein 'isfy accomplislied*y by*A the l relative-- pressure Aincharrrbeif's-'0 5'0i5I30`Site sidesefava-life operating diaphragm hvunit"includinga-ibleed passage bet'vv/een*sa-iet-`4 hambers; 'andA riovel--prevteclive nreans' te-vpreventt foreigny rnatter-l from ygairri-ngvaceessto 'and clogging-said -bleedl'#passaugze- Ai` furtherobject of* tHe;- invention` isf to .pro--4 lvide aval'veunit'wh is smoothand-*rapidi -foperati-errjI foolproof i; nd reclu-ires-4 a: minimum` toff-maitenance-'for repair.

A" further object' of theJ inventioneis@ to provide: :apractical valve uniti, and yet one-'wh'cli isefree tiveror--rneepurposee for which-*ie dsig'neu.KV These"objectsA are-`-acconrplished` byv meanshv oi"y such` structi'ire' an:d:relativeV arrangement 'ofi partsasiwil fungi appear;byfa:x perusal of the?fc'rll'evvingspecificationandclaimsr In' the-"drawings: l

Fig. 2 is a similarvieW,-. butishows.the valve in open position.

Referring now more-particularly `to :the characters of reference on the drawings, thev valve@ unit comprsesfaahollow'body;-indcated generally at I, Vwhich body is separatedinternally, into a main pressure chamber chamber' 3;"and a controlpre'ssure chamberie. Affpartitioniseparates" thep'ressure chamber 2 and' pressure outlet chamber" 3j whi1e: 'aa diaphragrn 6,. separates the pressureV chamber: Ziand control" pressure' chamber di' The diaphragm' B is` clamped;v adjacent its periphery, between initially separateportions oftheA body by' means of cap screws 1.

A fluid pressure supply pipe S is threaded into the body I in communication with the pressure chamber 2, and a pressure delivery pipe 9 is threaded into the body in communication with the pressure outlet chamber 3.

The partition is formed with a central port l0 therethrough, which port is formed with an annular tapered valve seat il, with Which a 2,@y aj pressureJr outletv L Qircular valvelifcooperates. TheJc-i'rcular' .vali/e1 l^2"isfs uppo1jted foraxialmevemeilrt: byv means of# oppositelgf'proj'ecting s te'rnsl`r i--lA andAv Utr theaterm- 4'3"engagingJ `inslidablerelation-1in`Vr aI guide bossy i5' inthewpressure outlet'charnben The stern-- lgf" projectsfr` centrally l'lrougll the' diaphragm? E aridslidably-extends-A rrtbfa guide Yboss [eli-n ther central'pressure-'chamberlli Afp'a clampingjwashers 'W2 are'disposedA on= oppositel-siees ofsaldidiaphragrnf, with the'vvasher Whicheis'irrthepressurechamber ZLrid-irigagainsty a stop shoulder assliowni 'Ar clar-npingnutL 181i isfthreaded nf' thej'stem l if in?` theQ contrelflpressure chamber e'andbears'- agains-tf'the@ adiacenti Washer Jl whereby'-toseeurethe assemblytor-lV getliegr; Itfj ivi'llfbfseerrthat upen-flex-ingA oCthes diephragrrrirlr'orrjie,` direetlonor the other-,'- the steinV M'vviflljbe correspondingly shitedirinf arr axial direction;f W'hereby to openoriclose'j the# valve lj2-.` The body? '"isf;formed` so astofpermitf of'1 such'movernentoi the diaphragm-1 v Ai. hel'rvellr wound bbmpressierr Spring se is' disposedt in tlfiejcontrol' pressurechamber inf. Srmunenej; felation" teithesteml le: 'Saidjfsrrine bearingfatffone end V`ag'ainst-tljie adj acentclampingf' washer t'i; ari-dat' the `other en dfagainst-the body-i- Tiie stern hij is iformjed with an axial bore 20= openjfrorn' thek end off'j said stem in chamber 4'- to `a 'pointiadjracent but-{sl'lortgoi;V the circular valve l 2': Within' the pressure l"chambersY 2'-l the Y steml Ml is.Y formed With a series )of spaced; circumferl ential grooves 2 fr; .aridfal longitudinafl channel 212 establishes communication, between said circular-- grooves radially inv/a1 yoiithe'periphferals r' face ci?A the adjacentportionjo said,V sterreV short;l [radial`- bore -"l'eads-- lrorn the Yehannel' 22 b etvveenapair ofjs v roofves 211, andsaidfradiali bore: terminates shertl'eftheaxial bere-i2i'3f. A veryVv small bleed'^duct- 2li'-l4 communicates betweentheradialb'ore E3 and theaxial rb'ore'tf.-

A Perforet@ 0r. ereen, Sleeve'25c10se1rsur rounds, thestern Mibetvveen the jcircular yvalve i 2 andthe adjacent" clamping vv'ashergV l1", whereby to prevent access oin 'foreign'V mattery into/ the" 5de" scribed arrangement of grooves 2l, channel 22, radial bore 23, and bleed duct 24. The grooves 2l and channel 22 are provided so as to assure a free delivery of pressure from Within chamber 2 to the radial bore 23, and through the bleed duct 24 into the axial bore 20.

In order that pressure from the axial bore 20 may deliver into the control pressure chamber 3 without creating any back pressure in the axial bore 20, a lateral bleed opening 26 is formed in the stem in communication with said axial bore 20.

A control conduit 2'I is threaded into the body I in communication with the control pressure chamber 4, and said conduit 21, which may be of substantial length, has a hand actuated valve 28 interposed therein adjacent its outer end.

While the described valve unit is adaptable for many uses, itis primarily designed for use in cannection with a Sandblasting machine, wherein it functions as follows:

The described valve unit is mounted on the Sandblasting machine, and air pressure is supplied through pipe 8 to said valve unit, and from the latter said pressure delivers into the machine by pipe 9 when valve I2 is open.

Sandblasting machines normally include a re1- atively long air-sand delivery hose having a nozzle on the outer end thereof, and in this type of machine the control conduit 21 is extended to a point with the valve 28 adjacent said nozzle for ready access by the operator.

When pressure is created in chamber 2 from pipe 8, it immediately feeds through the described bleed passage arrangement into the control pressure chamber 4, causing the pressures in chambers 2 and 4 to equalize, whereupon the spring I9 closes the valve I2; assuming that the hand actuated valve 28 is likewise closed. With valve I2 closed no air delivers to the Sandblasting machine, and the latter is inoperative.

When the operator desires the Sandblasting machine to function he merely opens the valve 28, which relieves the pressure in chamber 4. As the conduit 21 is of a diameter to relieve the pressure in said chamber 4 more rapidly than it can build up through the described bleed passage arrangement, a dilferential in pressures results on opposite sides of the diaphragm 6; i. e. the pressure in chamber 2 is much greater than the pressure in chamber 4. When this occurs the diaphragm is forced from the position shown in Fig. 1 to the position shown in Fig. 2, whereupon the valve I2 is moved to its open position and air pressure delivers to the Sandblasting machine.

To shut off the valve unit and consequently discontinue operation of the Sandblasting machine, the operator closes valve 28. When this occurs the pressures in chambers 2 and 4 quickly equalize, and the valve unit moves to its closed position under the inuence of spring I9, as heretofore described.

From the foregoing description it will be readily seen that there has been produced such a device as substantially fulfills the objects of the invention, as set forth herein.

While this specication sets forth in detail the present and preferred construction of the device, still in practice such deviations from such detail may be resorted to as do not form a departure from the spirit of the invention, as defined by the appended claims.

Having thus described the invention, the following is claimed as new and useful, and upon which Letters Patent are desired:

1. In a valve unit, a hollow body, a diaphragm mounted therein to form a main pressure cham ber and another chamber, a valve in the body, a stem on the valve extending from the main chamber into the other chamber axially through and attached to said diaphragm, spring means urging the stem in a valve closing direction, there being passage means formed in the stem to bleed pressure from the main chamber to the other chamber, and means to release pressure from said other chamber; said passage means being formed by providing the stem with an axial bore open to the other chamber, a radial bleed duct in the stem extending from said bore into communication with the main chamber, a screen sleeve surrounding the portion of the stem in said main chamber, that portion of the stem in the main chamber being formed with a plurality of spaced circumferential grooves, and a longitudinal channel connecting said grooves, the radial bleed duct opening into said channel.

2. A valve unit comprising a hollow body, a diaphragm, and a partition in the body separating the same into a central main pressure chamber, an outlet pressure chamber beyond the partition, and a control pressure chamber beyond the diaphragm; there being fluid pressure supply means opening into the main pressure chamber, fluid pressure outlet means opening from the outlet pressure chamber, 'and fluid pressure release means arranged with the control pressure charnber; a valve stem extending axially through the diaphragm and attachedthereto, a valve on the stem in the main pressure chamber, the partition having a valve port therein with which the valve cooperates, a helical, compression spring in the control pressure chamber about the same and urging the diaphragm in the direction of the partition, and bleed passage means in the stem communicating at opposite ends with the main chamber and control pressure chamber; said bleed passage means being formed by an axial bore in the stem open to the control pressure chamber,

a radial bleed duct in the. stem from the bore,

a longitudinal channel on the stem in the main chamber, the bleed duct opening into the channel, a plurality of spaced circumferential grooves onthe stem in the main chamber, the channel intersecting said grooves, and a screen sleeve on.

the stem in the main chamber in protective relation to said grooves, channel, and duct.

WILLIAM M. MYERS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

